California earthquakes

M2.8 earthquake 2 km SW of Ridgemark, California

A magnitude 2.8 earthquake struck 2 km SW of Ridgemark, California on Sun, Apr 26, 1987, 3:27 AM PDT (10:27 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M4.1 5 km NNE of Tres Pinos, California. This one was a foreshock.

Ridgemark forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
2.8 (md), micro
Local time
UTC
1987-04-26 10:27:34 UTC
Depth
13.3 km (8.3 mi), shallow
Epicenter
36.795° N, 121.389° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.2 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
26°
Stations used
85

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 122 in the 60 days after this one and 79 in the 30 days before it.

After

  1. 2.3Central California · 14400 days ago · 4 km deep · 13 km away
  2. 2.025 km NE of Soledad, California · 14400 days ago · 9 km deep · 35 km away
  3. 1.63 km NNE of Pacific Grove, California · 14399 days ago · 11 km deep · 49 km away
  4. 2.216 km SSE of Livermore, California · 14398 days ago · 8 km deep · 88 km away
  5. 2.314 km E of Seven Trees, California · 14398 days ago · 3 km deep · 61 km away
  6. 1.616 km SSE of Livermore, California · 14397 days ago · 3 km deep · 88 km away
  7. 1.621 km SE of Big Sur, California · 14397 days ago · 10 km deep · 74 km away
  8. 2.85 km NNE of Tres Pinos, California · 14397 days ago · 8 km deep · 10 km away
  9. 1.94 km S of San Juan Bautista, California · 14396 days ago · 7 km deep · 13 km away
  10. 1.8Central California · 14396 days ago · 17 km deep · 85 km away
  11. 1.8Central California · 14396 days ago · 7 km deep · 1 km away
  12. 4.15 km NNE of Tres Pinos, California · 14396 days ago · 8 km deep · 10 km away
  13. 1.94 km NE of Tres Pinos, California · 14396 days ago · 7 km deep · 9 km away
  14. 3.15 km NNE of Tres Pinos, California · 14396 days ago · 8 km deep · 10 km away
  15. 1.714 km E of Seven Trees, California · 14396 days ago · 3 km deep · 61 km away
  16. 1.714 km E of Seven Trees, California · 14395 days ago · 2 km deep · 61 km away
  17. 1.618 km SSE of Tres Pinos, California · 14394 days ago · 6 km deep · 22 km away
  18. 1.94 km NE of Tres Pinos, California · 14394 days ago · 8 km deep · 9 km away
  19. 2.05 km NNE of Tres Pinos, California · 14394 days ago · 8 km deep · 10 km away
  20. 1.815 km SSE of Livermore, California · 14394 days ago · 4 km deep · 89 km away
  21. 1.65 km SW of Gilroy, California · 14393 days ago · 3 km deep · 27 km away
  22. 2.34 km SSE of San Juan Bautista, California · 14393 days ago · 7 km deep · 12 km away
  23. 1.823 km ENE of Soledad, California · 14393 days ago · 6 km deep · 44 km away
  24. 1.622 km SSE of Tres Pinos, California · 14392 days ago · 4 km deep · 27 km away
  25. 1.623 km ENE of Soledad, California · 14392 days ago · 4 km deep · 43 km away
  26. 1.923 km ENE of Soledad, California · 14392 days ago · 4 km deep · 43 km away
  27. 1.613 km N of Morgan Hill, California · 14390 days ago · 3 km deep · 55 km away
  28. 1.618 km SSE of Tres Pinos, California · 14390 days ago · 6 km deep · 21 km away
  29. 1.7Northern California · 14389 days ago · 7 km deep · 39 km away
  30. 2.29 km SE of San Juan Bautista, California · 14389 days ago · 7 km deep · 8 km away
  31. 1.622 km NNE of Soledad, California · 14389 days ago · 6 km deep · 28 km away
  32. 1.89 km ESE of East Foothills, California · 14388 days ago · 1 km deep · 67 km away
  33. 1.614 km ESE of East Foothills, California · 14388 days ago · 1 km deep · 66 km away
  34. 2.19 km ESE of Gilroy, California · 14388 days ago · 5 km deep · 22 km away
  35. 1.521 km NE of Soledad, California · 14387 days ago · 2 km deep · 30 km away
  36. 2.018 km WSW of Mendota, California · 14386 days ago · 1 km deep · 72 km away
  37. 2.421 km NE of Soledad, California · 14386 days ago · 2 km deep · 35 km away
  38. 2.14 km NE of Tres Pinos, California · 14386 days ago · 7 km deep · 9 km away
  39. 1.613 km N of Morgan Hill, California · 14385 days ago · 3 km deep · 55 km away
  40. 1.819 km SSE of Tres Pinos, California · 14385 days ago · 4 km deep · 24 km away
  41. 2.4Northern California · 14385 days ago · 14 km deep · 83 km away
  42. 1.9Central California · 14385 days ago · 1 km deep · 78 km away
  43. 1.713 km N of Hollister, California · 14384 days ago · 6 km deep · 20 km away
  44. 1.617 km SSE of Tres Pinos, California · 14383 days ago · 4 km deep · 21 km away
  45. 2.87 km NNE of East Foothills, California · 14382 days ago · 7 km deep · 80 km away
  46. 1.812 km NE of East Foothills, California · 14382 days ago · 5 km deep · 81 km away
  47. 2.613 km ENE of East Foothills, California · 14381 days ago · 7 km deep · 77 km away
  48. 1.817 km SSE of Tres Pinos, California · 14381 days ago · 4 km deep · 21 km away
  49. 2.08 km WNW of Davenport, California · 14380 days ago · 12 km deep · 83 km away
  50. 2.12 km ESE of San Ardo, California · 14379 days ago · 11 km deep · 98 km away
  51. 2.220 km W of Lockwood, California · 14379 days ago · 2 km deep · 96 km away
  52. 2.315 km SSE of Livermore, California · 14378 days ago · 4 km deep · 89 km away
  53. 2.114 km N of Morgan Hill, California · 14378 days ago · 3 km deep · 57 km away
  54. 1.923 km ENE of Soledad, California · 14378 days ago · 4 km deep · 43 km away
  55. 1.718 km SSE of Tres Pinos, California · 14377 days ago · 10 km deep · 22 km away
  56. 1.814 km N of Morgan Hill, California · 14376 days ago · 6 km deep · 57 km away
  57. 1.518 km SSE of Tres Pinos, California · 14376 days ago · 10 km deep · 22 km away
  58. 1.618 km NE of East Foothills, California · 14375 days ago · 4 km deep · 84 km away
  59. 2.018 km NE of East Foothills, California · 14375 days ago · 4 km deep · 84 km away
  60. 1.816 km E of Seven Trees, California · 14374 days ago · 6 km deep · 59 km away

The first 60 of 122.

Before

  1. 1.77 km E of East Foothills, California · 14401 days ago · 8 km deep · 70 km away
  2. 2.123 km NNE of San Lucas, California · 14403 days ago · 5 km deep · 71 km away
  3. 3.113 km ESE of Alum Rock, California · 14403 days ago · 7 km deep · 64 km away
  4. 2.123 km NE of San Ardo, California · 14404 days ago · 7 km deep · 88 km away
  5. 2.221 km NNE of Soledad, California · 14404 days ago · 6 km deep · 29 km away
  6. 1.57 km ESE of East Foothills, California · 14404 days ago · 1 km deep · 70 km away
  7. 1.621 km NE of Soledad, California · 14404 days ago · 2 km deep · 32 km away
  8. 1.921 km NNE of Soledad, California · 14405 days ago · 6 km deep · 29 km away
  9. 2.27 km NNE of East Foothills, California · 14405 days ago · 7 km deep · 80 km away
  10. 1.87 km NNE of East Foothills, California · 14405 days ago · 7 km deep · 81 km away
  11. 3.27 km NNE of East Foothills, California · 14405 days ago · 7 km deep · 81 km away
  12. 1.935 km W of Lockwood, California · 14405 days ago · 11 km deep · 91 km away
  13. 2.017 km S of Big Sur, California · 14405 days ago · 12 km deep · 84 km away
  14. 1.75 km ENE of Hollister, California · 14406 days ago · 7 km deep · 10 km away
  15. 1.524 km NE of Greenfield, California · 14407 days ago · 0 km deep · 47 km away
  16. 2.78 km NE of San Martin, California · 14407 days ago · 7 km deep · 39 km away
  17. 2.01 km W of Tres Pinos, California · 14407 days ago · 4 km deep · 4 km away
  18. 1.617 km NNE of Soledad, California · 14407 days ago · 11 km deep · 28 km away
  19. 1.621 km NE of San Lucas, California · 14408 days ago · 7 km deep · 78 km away
  20. 2.822 km NE of San Lucas, California · 14408 days ago · 9 km deep · 78 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc99243. Read Mon, Sep 28, 2026, 6:28 PM UTC.